how to start mandriva installation?

I installed Mandriva on a Dell laptop, and put that hard drive into another laptop... a Medion...
(because the Medion doesn't have a working cd drive)
now the xorg.conf file has all the settings for the dell
i dont know what to edit in the file when i am looking around
so how can i run the installation again to reset the settings?
i know the disk is copied somewhere on my hard drive, i did it
during the first install...
so can i start it up again?